We now have a C7 builder, so I tried to disable kdump in centos/7 via kickstart, by adding "%addon com_redhat_kdump --disable" to the kickstart file. [1] But when I boot the test image I created, systemctl reports kdump as enabled, I found "%addon com_redhat_kdump --enable --reserve-mb='auto'" in /root/anaconda-ks.cfg, and I see no mention of kdump in the generated kickstart file. [2] Is something stripping away that section even before it reaches the C7 builder?

it seems that ksvalidator is ran on kojihub (which is still c6) so it stripped what it doesn't understand before creating the task that is then caught by the c7 builder.
Waiting for a pykickstart pkg that can be bumped/built on c6